Inclosed electric fuse.



Y 13. s. LUTHER. INGLOSED ELECTRIC FUSE.

APPLIoATIoN FILED LPn.1a,191o.

Patented Aug. 23, v1910.`

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B. s. LUTHER; INCLUSED ELEGTBIG FUSE.

LPPLIUATION FILED APB. 1B, 1910.'

968,1 '74. Patented Aug. 23', 1910.

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yLeiiin.rinviiN is,,'LiJiiiIiinQ-orNEWBRYPRQ, iviAssA'ci-:fusn'rfrs,l AssiefNon Tc THE PATENT 4 .cHasn-snaialli/121.I'J?ooi/.trahirl or'iso's'ron,t MAssAcHUsETrs,.A CORPORATION 4or ".'iNcIlosED-ELQTRICS FUSE'.

To all whom 'it may cana-em:

Be itI Vknown tliatl, BENJAMIN S. LUTHER, ofNewburyport-in the 'count'y of Essex and ySta-te oi'-h/Iassachusetts, have invented an Improvement :iii-igl-Inclosed Electric Fuses,

` of which the following-isa. specification.

T his invention relates to inclosed electricfiises, and particularlyt'thosefhaying indi- 'caters of the explosive type 'if-or: indicating lWhenthe fuse blows.` In', electric-fuses ot' this` description a wire .is usually connected with the indicator, which attached at its ends to the conducting-terminals of the fuse, at points within the fuse-case. "Aninclosed indicator-Wire, havingits points o attach-1 ment within the case, cannot be .tested easily, and, lforthis reason, is usually not tested. Furthermore, in the process of nianufacturethere is liabiltyof the inclosed indicator Wire` breaking or yb'econ'iing'g detached, and thereby rendered. inoperative, but, as said wirev is-entirely concealed Within the fuse-case, sucli accidental injury is' not known previous to the blowing Aof the tusej `Theobject-ol" this` intention is to provide an inolosed electric-fuse havin'g an indii cator...with an indicator-wire', whereby the.

by electrically connectv vobjections above noted,- are Overcome,V and consists` in providing'the' indicator-Wire with conducting-terniinals ofits own, whichv are independent of the vcondiictiiig-terminals of the fuse, and which are adapted to be ai'- ra-nged outside of the fuse-case,y and' to bev disposed relative to the conducting-,terminals lof the fuse, so Vt'hatfwhen the, conducting-terminals of the fuse .gare placed in mechanicalV and electrical' engagement with" the usual supporting-clips, on tlie'base, the conducting-terminals of'the indicator-wircl are likewise placed in mechanical and electrical engagement Witlithe'said clips, vthere- .b the, indicator- Wire inparallel With tlii'elffuse-strip.

i indicator-Wire having*conducting-terminals of its own, adapted to be arranged outside yof the Vfuse-case. may ybeeasily applied and p.

also tested independently ofthe fuseestrip,

and, fiirthei'gnliore, less wireiis-required than in the instance above recited..

Figure l'is a-planIy-iei' of an electric-fuse arranged on a baseiwith the supporting` longitudinal vertical section of the electricfuse shown iii Fig. 1, taken on the dotted line 2 2, Fig. 3 is a side elevation of the .the dottedcline 10-10.

cate that thef'fiise has blown'. l l dicator is shown in Lett-ersy Patent `.',#801,{i67,

lips, Fig. 2 isal speificiinnpf Leiters-'Patent' Pateted Aug, 23,1910.'- l l Appiicfion ined Api-iris, 1910. seriai Nq. 556,184. i I

electric-fuse shown in Fig. 1, .F ig. 4, is an enlarged sectional detail takenon the dotted line 4 4. Fig. 3.4 y Fig. 5,.is.aii enlarged sectional'detail ot' one ot the indepeiidentfcon `:fuse shown in Fig. 8,' taltenjon the "dotted line 9-9,; Fig. 10 is a ytra`i ifs.i ei'se. Asec-tion ot the velectri -fiise showny in Fig. 8, taken on a represents the body of, the fuse-case of' cyliiidricalgor other forin".V con'ipose'd of insulating material; (1.', d', the. 'cylindrical nietallic caps arranged on the opposite ends o-t' said bodyf;` a fuse-strip contained' in the case, andiattached at' its endstoconduct-ingterininalstb, 7)', which-latter' arei'nade as flat' platesf or blades extending through holes in' the end-caps a', (if, and adapte-dto inechanically engage supporting'clips` c, c,

"which are arranged on abasei Any'V usual ir-suitable finely divided refractory filling rl is contained in ,the casewii'hich is packed arounditlie fiise-sti'i'pand t-lie inner ends of the cond-ucting-terminals. Such a. fuse is of well-known construction` andvis here. shown nierely t'or the purppse of illust-rating my intientioii. At a point on the inside of the `wall of fthe fuse-case, reinote fromv the arcforniir'ig'point of the fuse-strip, an indicator 'c is arranged over ahole in vthe case. This indicator is of the 'explosive type aiid=- is designed to keject'aplug-troni the hole iii the. case, orto perform. Sonie other act toindi- Such an indated ohci.. 1051905;

f representst-he indicator-Wire which is attached to the indicator and is made to extendlt-herefroni inopposite ways and to extend .throughout the lweiigtlilof fthe fusecase,l and throughthe lend-cap s, that its opposite ends yterminate outside the fusecase. The indicator-wire -is arranged adjacent the fuse-strip and operates as a fuse to cause the indicator to explode whenthe. fuse blows. rThe ends of the. indicator-Wire, in- I stead oi' being attached directly to the conducting-tern'iinale of the fuse, at points in-v side the fuse-case, are here shown as having condueting-tern'iinals ot' its own. which -artl madejseparate from or independent ot the yconducting-terminals of the fuse, a nd which are arranged outside of thev inse-case, so as to be accessible for the purpose otl testing the to the plates. y ventioii the results obtained by the constriicindicator-w1re independently of the fuse.

`As shown in Figs. 1 to 6, g, g, represent the separate or independent. conductingterminals, which are attached to the opposite ends of the indiiator-wire. They are made as small plugs, adapted to be arranged in holes in the condnoting-terminals b', b,

yWith their exposed faces Hush with the sides of said terminals` b, b. 'lhey are insulated. *from the conducting-terminals li', b', so as to be entirely separate i therefrom. The are arranged on the conducting-terminals b', more particularly for convenience, so that When the fuse is placed in the supportingclips and the conducting-terminals b, b',

engagev said clips, said separate conductingterininals g, g, will also engage said clips and electrical connection thereby be established. terminals b,b, 'are formed with passages b2' for the ends of the indicator-wire, and,A referring to Fig. G, the ends oit the indicator- Wireare extended through these passages and through'the insulation contained in the holes inthe conducting-teriuiuals b', so as to directly engage the plugs y. Said plugs,

for simplicity ot' coi'istruction, iuay be inadc as headed studs, adapted to be set in holes, zhaving vwashers placed on the ends t.hercot" opposite the heads which are held in place by upsetting/said ends.

Referring to Figs. 7 to 1.0, the separate and independent condnoting-termina s for the indicatoi.-\vire are shown as small plates h, arranged on the outside of the case, and extending into recesses v.formed in the endcaps, and the ends of the indicator-wire are connected to said plates by rivets extending through the wall ot the ease and connected In this enibodiu'ient of my intion shown in the alforcsaid eu'ibodiinent of y my invention are obtained. The fuse shown in Figs. 7 to l() is designed to. engage the sup-v porting-clips by its metallic end-caps, and the separate conducting-terminals 7i, `being arranged in recesses in said caps, are properly disposed to engage said clips, as, shown in Fig. 8. Like the form shown in Fig. 2,

"separate and independent conducting-terl eoV Aminals are here provided for the indicator- Wire, which are ar anged outside the fuseeseyand'exfposed so that the indicator-wire may be tested separately from the fuse.

From the foregoing it, is apparent that my tions.

invention is susceptible of other inoditivi- I claim: 1. In aninclosed electric-fuse, Va fuse-strip As here shown,y the conducting-A attached' to a pair of conducting-terminals. arranged at theopposite-ends of kthe ,fuseease, an indicator, and an indicator-wire arranged in connection with said indicator and adjacent thefusc-st-rip, and a separate pair of conducting-terminalsl attachedl to the ends of said indicator-wire, substantially as described,

2. In au iuclosed electric-fuse, the com bination ot a fuse-stri p attached to a pair of conductiug-terminals arranged at the opposite ends ot a fuse-case, an indicator, an indicator-wire yarranged in connection with y said indicatf and adjacent the fuse-strip, a

separate pair of ,conducting-terminals `at.-

tachedy to the ends of'said indicator-wire, `the conducting-terminals of one pair being insulated from the conducting-terminals of the other pair and disposed relativelyto each other to engage the saine supportingclips, substantially as described.

3: In an inclosed electr1cfuse,tlie vcoinbination of a fuse-strip attached to a pair` of conductii'ig-.terminals arranged at the opposite ends of the fuse-case, an indicator, -an

indicator-wire arranged in connectionwith 'ininals arranged outside the case,- which are attached to the ends of said indicator-wire, and are insulated from the aforesaid conducting-terminals, substantially as described. 5. In an inclosed electric-fuse, the 1coin'- I bination'of a fuse-strip attached to a pair of conducting-terminals arranged at the opposite ends of the `fuse-case, an indicator within ,said case, an indicator-wire arranged in connection with said indicator, having its ends extended outside of the ends of the case, and a separate pair of conducting-terminals arranfred outside the-case, attached to the ends of said indicator-wire and4 sup- 'ported`by, but insulated from, the aforesaid conducting-terminals, substantially as. described.- y

.6. In an inclosed electric-fuse, the poinbination of a fuse-strip attached to a `pair 5of condueting-terininals arranged at opposite ends of the fuse-case, an indicator, an indicator-wire arranged in connection with said indicator, having its ends extended beyond the' ends of the case, a separate pair of conducting-ternainalsv attached to the ends of said indicatorwire which are arranged in.' holes in the aforesaid conducting-terminals and areV insulated therefrom, the exposed faces of said separate conductinff-terminals being finsh withv the sides of the fuse-teznxinals, substantially as described.

7. In an inclosed clectric-fuse, the comhination of afuse-stri p attached to a pairof condnoting-terminals arranged at Iopposite ends of the fuse-case, an indicator, an indicator-wire arranged in connection with said indicator, having its ends extendedthrough passages in said conducting-terminals to points heyond'the ends of the case, a sepa.- ratc pair of co1idncting-terminals attached to the ends of said indicator-wire which are .set inlholesin the aforesaid conducting-terminals, Hush with the sides thereof, and insulated therefrom, substantially as described.' V

8. In an inclosed electric-fuse, thecom! binat-ion of a' fusebase, 4supportingclips thereon, an inciosed electric-fuse having a fuse-strip connected with a pair of conducting-terrninals adapted to engage saidclips, an indicator, an indicator-wire arranged in connection with said indicator, a separate pairr of condacting-terminals attached to the f ends of 4said indicator-wire,also adapted to engage said clips,- and insulating-means for separating the condiictingsterninais of ono 4pair, from the` other, substantially as described.

9. In an inclosed electric-fuse, the com-H bination vof a fuse-base,` su porting-'clips thereon,an inclosed electric-Rise having a fase-strip connected with av'par of conducting-terminals adapted to engage said clips, an indicator, an indicator-wire arranged .in connectionl with said indicator, a separate pair of conducting-terminals attached to the i ends of said vindicater-wire also adapted yto engage said clips, substantially as described. 10.4 In an inclosed electric-fuse, the'com binati'on of a fuse-base, s11)pox'tingclips thereon, an' inclosed electricuse having a fuse-stripI connected with a pair of conducting-terniina1s adapted to engage said clips, an indicator, ,an indicator-.wire arrangedin connection with said indicator, a separate pair of conducting-terminals attached t'o the ends of said indicator-wire also adapted to `enggage in a manner to insure electricalcon'n tactWith a portion of the clips on said base, substantially as described,v j

In testimony whereof, ,I have signed my name to 'this specification, in the presence of two subscribing witnesses.

BENJAMIN S. LUTHER..

XVitnesses:

B. ,INOX-ns, II. B. Davis. 

